Supergirlx: Satanna's Revenge

Satanna, an evil duplicate of Supergirlx, was created by Red Kryptonite. Realizing her time was limited,(Red K only affects Kryptonians for 48 hours) she attacked the mighty heroine, only to be defeated and returned to Supergirlx's body.

But someone had other plans--and the evil part of Supergirlx got free again. This time, she did not intend to fail.